Your bleeder is too small. All you need a bleeder for on a C input filter
P.S. is to drain the HV after shut-down. Your 100,000 ohm resistor is
flowing 160 ma of current, and just heating itself, your components, and
your ham shack. I would use at least 200 k to 400k ohms. In all my 4 kv+
power supplies here, I use 4 X 100k ohm @ 100 watt units in series. (225
watt units will be better) Even these get really warm, but do the job just
fine. I always double the wattage on the bleeder resistors as a safety
factor. You don't want one of these babies to go open on you!
(((73)))
Phil Clements, K5PC
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of aborg
Sent: Sunday, April 24, 2005 7:44 AM
To: Amps Amps
Subject: [Amps] Bleeder Resistor Inquiry
I am currenty building a HV Power Supply using a
4800vac pole pig, 40uF 5kv oil filled cap , 10kv PIV
rectifier board, 20 amp variac and a 100k 225watt
bleeder.
The initial power up started well without the bleeder
connected to the circuit after 30 min burn-in no
problems. Discharged the circuit and added the 100k
bleeder and 5 mins the bleeder starts to smell and the
exterior paint starts to bubble. Shut it down and
examined the circuit, all seem accurate.
Question : Is my bleeder to small ?
P.S. : The variac was set at 4KV at all times.
Mike-KK4MS
a_borg@yahoo.com
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|